While using it as a primary price is problematic, since we don't really know how it is calculated (and the lack of transparency opens up the possibility of manipulation), it's a great way to sort of double-check the TCG-Mid price
Notable about Rootha is that she cares about the mana value, not the mana cost unlike some cards, which means that spells that reduce their cost are fine here, and that she only rewards one spell on your turn, so to maximize her you want to lean into those elements
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Aquatic Alchemist Ashling's Command Ashling, Rekindled Ashling, Rimebound Ball Lightning Belion, the Parched Beza, the Bounding Spring Blazing Bomb Bramble Familiar Catharsis Champion of the Path Child of the Volcano Colorstorm Stallion Cosmogoyf Deceit Diamond Weapon Driftgloom Coyote Eclipsed Flamekin Eddymurk Crab Eirdu, Carrier of Dawn Elemental Mascot Eluge, the Shoreless Sea Emptiness Enraged Flamecaster Explosive Prodigy Fecund Greenshell Fire Elemental Flame-Chain Mauler Flamebraider Flamekin Gildweaver Flaring Cinder Fleeting Effigy Flourishing Bloom-Kin Frostbridge Guard Galewind Moose General Traag, Heart of Stone Gigastorm Titan Hearth Elemental Hivespine Wolverine Huskburster Swarm Hydro-Man, Fluid Felon Ice Flan Icewind Elemental Icewrought Sentry Isilu, Carrier of Twilight Kindle the Inner Flame Kithkeeper Kulrath Mystic Kulrath Zealot Lavaleaper Living Conundrum Luminollusk Lumra, Bellow of the Woods Magmakin Artillerist Maha, Its Feathers Night Mindsparker Molten Man, Inferno Incarnate Moonshadow Mossborn Hydra Mouth of the Storm Muldrotha, the Gravetide Muldrotha, the Gravetide Photon, Living Light Prismabasher Quaketusk Boar Remnant Elemental Rimekin Recluse Rock Soldiers Rotisserie Elemental Rottenmouth Viper Sandman, Shifting Scoundrel Scalding Viper

We created noncreature cards with typal effects